NC072021/3/17-3/22
| NO. | Function | Operation | LED Status | |
| 1 | ANC on/AMBIENT/ANC off | Long press the MFB key for about 1s under Shutdown /Click the NC/AMBIENT button to shift | ANC /ANC on white light is on | ANC mode/transparent mode/ANC off |
| 2 | The noise reduction mode | 1. ANC noise reduction can be used together with Bluetooth
2. When the earphone is powered, ANC noise reduction can also be used together with AUX |
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| 3 | Power On | Long Press the MFB key for about 1s under shutdown | The white light always goes on for 1s | power on
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| 4 | Power off | 3s/Long press the MFB key for about 3s when the machine is on | The red indicator light always goes on for 1 second and then goes | power off |
| 5 | Paired connection successful | The phone searches for headphones and connects | Bluetooth connected | |
| 6 | Connection is broken | Phone and earphone connection out of range (> 10 m) | Bluetooth disconnect ted | |
| 7 | Aux input | Insert the line – in | / | / |
| 8 | Adjust the volume | Short press volume + button to increase the volume | / | / |
| 9 | Adjust the volume | Short press volume – Button to reduce the volume | / | / |
| 10 | Songs to choose | Double-click Volume -button for the previous track | / | / |
| 11 | Pause/Play | Short press the MFB button | / | / |
| 12 | Answer/end calls | Short press the MFB button | / | / |
| 13 | Refuse to answer the phone | Long press the volume + button for 2 seconds to reject calls | / | / |
| 14 | factory data reset | When in charge, long press MFB + volume + 3s | / | / |
| 15 | Reset | If the headset does not turn on even after full charge or does not respond during use, please follow the following steps to reset it: Connect the headset to the COMPUTER’sUSB port or USB power adapter with the charging cable. The red indicator lights up to indicate that the headset has been reset | The red indicator light is always on
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| 16 | Low power alarm | 3.35V | The red light flashing | Battery low |
| 17 | charging | Use DC5V power to input USB-C charging cable to charge the headset | The red indicator will | / |
| 18 | The firmware update | Insert USB-C, double click the power button to enter DFU mode, and upgrade through the computer | HID devise DFU upgrade | / |
| 19 | DUT test mode | 1. Three MFB keys at the same time2. After DUT operation, it is necessary to replug and unplug the | The red and blue lights flash three times at the same time | |
| 20 | Compatible with | Phones, computers, | ||
| 21 | Power display
4.2V 100%4V 80%3.8V 60%3.6V 40%3.35V 20% |
iPhone, iPad the device, Android 8.0 above |
| The Bluetooth audio device will shut down the automatically if it is not connected to the audio device for more than 10 minutes. If it is connected to the audio device, it will not shut |
| Prompt every 3 minutes |
| Plug one end of the USB cable into the computer and plug in the headset |
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